US6332716B1 - Composite bearing - Google Patents

Composite bearing Download PDF

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Publication number
US6332716B1
US6332716B1 US09/453,059 US45305999A US6332716B1 US 6332716 B1 US6332716 B1 US 6332716B1 US 45305999 A US45305999 A US 45305999A US 6332716 B1 US6332716 B1 US 6332716B1
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United States
Prior art keywords
ptfe
resin
resin layer
weight
molecular weight
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Expired - Lifetime
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US09/453,059
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English (en)
Inventor
Eiji Kato
Katsumi Sawano
Takayuki Shibayama
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Daido Metal Co Ltd
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Daido Metal Co Ltd
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Assigned to DAIDO METAL COMPANY LTD. reassignment DAIDO METAL COMPANY LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, EIJI, SAWANO, KATSUMI, SHIBAYAMA, TAKAYUKI
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S384/00—Bearings
    • Y10S384/90—Cooling or heating
    • Y10S384/908—Nylon or polytetrafluorethylene

Definitions

  • This invention relates to a composite bearing in which to a backing metal is bonded a resin layer in which polytetrafluoroethylene (referred to hereinafter as PTFE) is added to a base resin consisting essentially of polyether ether ketone (referred to hereinafter as PEEK).
  • PTFE polytetrafluoroethylene
  • PEEK polyether ether ketone
  • bearings to be incorporated into a generator, a pump or the like bearings in which a resin layer is bonded to a backing metal have heretofore been known.
  • a composite bearing applied under such severe conditions is required to have not only excellent sliding characteristics but also various properties such as high mechanical strength and the like.
  • a bearing which is repeatedly subjected to, for example, starting and stopping requires a great starting power because at the time of starting, the sliding surface of the bearing is partially in solid contact with a shaft or a pin, and there is a fear that this may result in peeling of the resin layer per se and in peeling and damaging of the bonding portion between the backing metal and the resin layer. Therefore, the bearing has been required to have, in addition to wear resistance and the like during the operation, a small coefficient of friction at the time of starting and required to be excellent in peeling strength of the resin layer per se and bonding force between the backing metal and the resin layer.
  • PEEK is an engineering resin having excellent heat resistance, mechanical properties and wear resistance; however, when PEEK is used alone, the coefficient of friction is high, so that a resin having a low coefficient of friction such as PTFE or the like is added to the PEEK to lower the coefficient of friction thereof. On the other side, however, it is known that the addition of PTFE results in deterioration of mechanical strength.
  • the technique disclosed in JP-A 58(1983)-160,346 teaches, as a sliding material to be used under the dry conditions, a resin consisting essentially of PEEK as the base material and also contains 2.5 to 60% by weight of PTFE and 2.5 to 60% by weight of carbon fibers. In the above publication, it is stated that a high heat distortion temperature (HDT) and a high limiting PV value are obtained with this resin composition.
  • HDT high heat distortion temperature
  • JP-A 9(1997)-157,532 of the present inventors as a sliding material for bearing, there is proposed a sliding resin composed of PEEK having added hereto 0.1 to 8.5% by weight of PTFE and 10 to 45% by weight of carbon fibers, based on the sliding resin. It is stated that with this composition, a sliding material excellent in wear resistance is obtained.
  • These inventions aim at adding carbon fiber to a base resin to improve the mechanical strength and wear resistance, and adding PTFE to the base resin to lower the coefficient of friction.
  • the present inventors have noticed that the mechanical properties of the resin composition are varied depending upon the shape of PTFE dispersed in the base resin and have found that the deterioration of mechanical strengths such as the peeling strength of the resin layer per se, the bonding force between the backing metal and the base resin, and the like can be prevented by dispersing PTFE in the form of particles in the base resin, whereby this invention has been accomplished.
  • a composite bearing in which to a backing metal is bonded a resin layer in which PTFE is added to a base resin consisting essentially of PEEK so that the proportion of the PTFE becomes 0.1 to 50% by weight based on the weight of the resin layer, and the PTFE is dispersed in the form of particles in the base resin.
  • the composite bearing of the first aspect of the invention wherein the PTFE has a molecular weight of at least 300,000.
  • FIG. 1 is a schematic view showing the section of the resin plate of Example 4.
  • FIG. 2 is a schematic view showing the section of the resin plate of Comparative Example 4.
  • FIG. 3 is a front view showing the outline of a peel test.
  • FIG. 4 is a graph showing the influence of the molecular weight of PTFE exerted upon peel strength.
  • FIG. 5 is a graph showing the influence of the PTFE content exerted upon peel strength.
  • FIG. 6 is a front view showing the outline of bonding force (shear strength) test.
  • FIG. 7 is a graph showing the influence of the molecular weight of PTFE exerted upon bonding force (shear strength).
  • FIG. 8 is a graph showing the influence of PTFE content exerted upon bonding force.
  • FIG. 9 is a graph showing the influence of PTFE content exerted upon coefficient of friction at the time of starting.
  • PEEK can be produced, for example, by the method described in JP-A 54(1979)-90,296, and it is desirable that the melt flow index thereof is in the range of 1 to 5 g/10 min as measured at 360° C. under a load of 2.16 Kg according to ASTM D1238.
  • the coefficient of friction of PEEK is decreased by adding PTFE thereto.
  • the content of PTFE is less than 0.1% by weight, its effect is not exerted sufficiently.
  • the content exceeds 50% by weight the molding properties are deteriorated. Therefore, the PTFE content should be 0.1 to 50% by weight. It is preferably 5 to 40% by weight from the viewpoint of wear resistance, more preferably 10 to 30% by weight in view of the relation between bonding force and coefficient of friction at the time of starting.
  • the molding using PEEK as a base resin is conducted with heating at a temperature not lower than the melting temperature of 334° C., usually at a processing temperature of about 400° C. for obtaining a sufficient fluidity.
  • the added PTFE has a molecular weight as small as about 200,000, the melt viscosity thereof is low and hence in the processing by a melt-molding machine, it is long elongated in the form of fibers.
  • the melt viscosity thereof is high, so that the PTFE is not elongated in the form of fibers and it becomes possible to disperse the PTFE in the form of particles as it is.
  • the resin layer does not contain the electrically conductive materials, it is possible to form an electrical insulating layer to electrically insulate between the bearing and the shaft or pin.
  • the mechanical strengths and wear resistance can be further enhanced by adding carbon fibers so that the proportion thereof becomes 10 to 45% by weight based on the total weight.
  • a composite bearing in which to a backing metal is bonded a resin layer in which PTFE is added to a base resin consisting essentially of polyether ether ketone so that the proportion of the PTFE becomes 0.1 to 50% by weight based on the weight of the resin layer can be made excellent in the peel resistance of the resin layer per se and the bonding force between the resin layer and the backing metal by dispersing the PTFE in the form of particles.
  • the bearing device requiring a measure for countering electrolytic corrosion, the omission of the insulation mechanism that has heretofore been considered necessary is made possible by using an electrical insulating layer as the resin layer, whereby the bearing device can be made simple in structure.
  • PEEK 450G (a trade name of ICI in United Kingdom).
  • the PTFE used above was C180 (a trade name of DAIKIN INDUSTRIES, LTD.) having a molecular weight of 500,000, C169 (a trade name of DAIKIN INDUSTRIES, LTD.) having a molecular weight of 300,000, L5 (a trade name of DAIKIN INDUSTRIES, LTD.) having a molecular weight of 200,000 or KTL610 (a trade name of Mitsui DuPont Fluorochemical Co., Ltd.) having a molecular weight of 100,000.
  • FIG. 1 and FIG. 2 show schematically the sections of the resin plates of Example 4 and Comparative Example 4, and it is confirmed that in FIG. 2 relating to Comparative Example 4, PTFE is long elongated in the form of fibers in the resin layer bonded onto the backing metal, while in FIG. 1 relating to Example 4, PTFE is present in the form of particles.
  • FIG. 5 the influence of the PTFE content in the resin plate exerted on the peel strength when the molecular weights of PTFE are 100,000 and 500,000 is shown with graphs, and it is confirmed that with an increase of the PTFE content, the peel strength is lowered in the two cases. Moreover, in the case of PTFE having a molecular eight of 100,000, low peel strength is shown as a whole and, at the same time, it is clear that the peel strength is rapidly lowered before the PTFE content reaches 10% by weight and gradually lowered in the PTFE content range larger than that.
  • a test of coefficient of friction at the time of starting was conducted as follows: On a copper-plated steel plate having a thickness of 3 mm, copper alloy powder was spread in a thickness of 0.5 mm and then sintered to form a porous, sintered layer. The above-mentioned resin plate was superimposed on this porous, sintered layer in the state that the porous sintered layer was heated at 350 to 400° C., and they were subjected to pressure-welding by a press and then to impregnation coating. Subsequently, it was processed into a washer shape having an outer diameter of 27.2 mm and an inner diameter of 22 mm to obtain test samples for the Comparative Examples and the Examples. Using the test samples for the Comparative Examples and the Examples obtained, a test of coefficient of friction at the time of starting was made under the conditions shown in Table 2. The results of these tests are also shown in Table 1.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sliding-Contact Bearings (AREA)
US09/453,059 1998-12-08 1999-12-02 Composite bearing Expired - Lifetime US6332716B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10348496A JP2000169697A (ja) 1998-12-08 1998-12-08 複層軸受
JP10-348496 1998-12-08

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040213492A1 (en) * 2003-04-23 2004-10-28 Michael Kim Composite bearings
US20040224590A1 (en) * 2003-03-31 2004-11-11 George Rawa Thermoplastic/fiber material composites, composite/metallic articles and methods for making composite/metallic articles
US20050139064A1 (en) * 2003-12-25 2005-06-30 Taiho Kogyo Co., Ltd. Sliding material comprising fluorine plastic and binder resin
US20060194021A1 (en) * 2004-01-15 2006-08-31 Nobuaki Takeda Sliding member, process for producing the same and coating material for sliding member
US20100089194A1 (en) * 2008-10-09 2010-04-15 Shimoda Masato Bearing assembly for worm drive and worm gear for use in a seat sliding mechanism for an automobile power seat
US20110097593A1 (en) * 2008-10-27 2011-04-28 Taiho Kogyo Co., Ltd. Ptfe-based sliding material, bearing, and method for producing ptfe-based sliding material
US20140086777A1 (en) * 2012-09-24 2014-03-27 Jinsung Park Synthetic resin bearing and scroll compressor having the same
US8690438B2 (en) 2010-04-27 2014-04-08 Minebea Co., Ltd. Sliding bearing having self-lubricating liner
US20140356210A1 (en) * 2013-06-03 2014-12-04 Lg Electronics Inc. Scroll compressor
US9121276B2 (en) 2012-07-23 2015-09-01 Emerson Climate Technologies, Inc. Injection molded seals for compressors
US9605677B2 (en) 2012-07-23 2017-03-28 Emerson Climate Technologies, Inc. Anti-wear coatings for scroll compressor wear surfaces
EP3276191A1 (en) 2016-07-28 2018-01-31 GE Renewable Technologies Hydrodynamic bearing pad construction
WO2019106404A1 (en) 2017-12-01 2019-06-06 Ge Renewable Technologies Bearing pad for a hydro-generating unit and hydro-generating unit with such a bearing pad
US11024441B2 (en) 2011-12-14 2021-06-01 Daikin Industries, Ltd. Insulated wire

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4668375B2 (ja) * 1999-08-19 2011-04-13 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー 低溶融粘度ポリテトラフルオロエチレン組成物
US10557057B2 (en) 2012-09-04 2020-02-11 Solvay Specialty Polymers Usa, Llc. High melt flow PAEK compositions
JP6211924B2 (ja) * 2013-12-26 2017-10-11 トヨタ自動車株式会社 摺動用樹脂組成物
JP6208817B1 (ja) * 2016-06-03 2017-10-04 株式会社カジワラ 撹拌装置
US11746676B1 (en) 2023-02-13 2023-09-05 General Electric Company Thrust bearing assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136439A (en) 1983-03-14 1984-09-19 Ae Plc Bearing material incorporating polyether ketone and ptfe
JPS63297457A (ja) * 1987-05-29 1988-12-05 Daido Metal Kogyo Kk ポリエ−テル芳香族ケトン樹脂組成物
GB2232679A (en) 1987-10-20 1990-12-19 Daido Metal Co Sliding member comprising low friction resin composition
JPH09157532A (ja) 1995-10-02 1997-06-17 Daido Metal Co Ltd 湿式スラスト軸受用摺動部材
GB2313632A (en) 1996-05-31 1997-12-03 Daido Metal Co Sliding thrust bearing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136439A (en) 1983-03-14 1984-09-19 Ae Plc Bearing material incorporating polyether ketone and ptfe
JPS63297457A (ja) * 1987-05-29 1988-12-05 Daido Metal Kogyo Kk ポリエ−テル芳香族ケトン樹脂組成物
GB2232679A (en) 1987-10-20 1990-12-19 Daido Metal Co Sliding member comprising low friction resin composition
JPH09157532A (ja) 1995-10-02 1997-06-17 Daido Metal Co Ltd 湿式スラスト軸受用摺動部材
GB2313632A (en) 1996-05-31 1997-12-03 Daido Metal Co Sliding thrust bearing

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040224590A1 (en) * 2003-03-31 2004-11-11 George Rawa Thermoplastic/fiber material composites, composite/metallic articles and methods for making composite/metallic articles
US20040213492A1 (en) * 2003-04-23 2004-10-28 Michael Kim Composite bearings
US20050139064A1 (en) * 2003-12-25 2005-06-30 Taiho Kogyo Co., Ltd. Sliding material comprising fluorine plastic and binder resin
US20060194021A1 (en) * 2004-01-15 2006-08-31 Nobuaki Takeda Sliding member, process for producing the same and coating material for sliding member
EP1705223A1 (en) * 2004-01-15 2006-09-27 Daikin Industries, Ltd. Sliding member, process for producing the same and coating material for sliding member
EP1705223A4 (en) * 2004-01-15 2006-09-27 Daikin Ind Ltd SLIDING ELEMENT, PROCESS FOR PRODUCING THE SAME, AND COATING MATERIAL FOR SLIDING ELEMENT
CN100381721C (zh) * 2004-01-15 2008-04-16 大金工业株式会社 滑动部件及其制造方法
US7718247B2 (en) 2004-01-15 2010-05-18 Daikin Industries, Ltd. Sliding member, sliding member manufacturing method, and coating for sliding member
US8864231B2 (en) * 2008-10-09 2014-10-21 Ntn Corporation Bearing assembly for worm drive and worm gear for use in a seat sliding mechanism for an automobile power seat
US20100089194A1 (en) * 2008-10-09 2010-04-15 Shimoda Masato Bearing assembly for worm drive and worm gear for use in a seat sliding mechanism for an automobile power seat
US20110097593A1 (en) * 2008-10-27 2011-04-28 Taiho Kogyo Co., Ltd. Ptfe-based sliding material, bearing, and method for producing ptfe-based sliding material
US8962143B2 (en) 2008-10-27 2015-02-24 Taiho Kogyo Co., Ltd. PTFE-based sliding material, bearing, and method for producing PTFE-based sliding material
US9080605B2 (en) 2010-04-27 2015-07-14 Minebea Co., Ltd. Sliding bearing having self-lubricating liner
US8690438B2 (en) 2010-04-27 2014-04-08 Minebea Co., Ltd. Sliding bearing having self-lubricating liner
US11024441B2 (en) 2011-12-14 2021-06-01 Daikin Industries, Ltd. Insulated wire
US9121276B2 (en) 2012-07-23 2015-09-01 Emerson Climate Technologies, Inc. Injection molded seals for compressors
US9605677B2 (en) 2012-07-23 2017-03-28 Emerson Climate Technologies, Inc. Anti-wear coatings for scroll compressor wear surfaces
US20140086777A1 (en) * 2012-09-24 2014-03-27 Jinsung Park Synthetic resin bearing and scroll compressor having the same
US9217433B2 (en) * 2012-09-24 2015-12-22 Lg Electronics Inc. Synthetic resin bearing and scroll compressor having the same
US20140356210A1 (en) * 2013-06-03 2014-12-04 Lg Electronics Inc. Scroll compressor
US9291164B2 (en) * 2013-06-03 2016-03-22 Lg Electronics Inc. Scroll compressor having a bush bearing provided on a boss of orbiting scroll
EP3276191A1 (en) 2016-07-28 2018-01-31 GE Renewable Technologies Hydrodynamic bearing pad construction
WO2019106404A1 (en) 2017-12-01 2019-06-06 Ge Renewable Technologies Bearing pad for a hydro-generating unit and hydro-generating unit with such a bearing pad

Also Published As

Publication number Publication date
GB2344624A (en) 2000-06-14
GB9928550D0 (en) 2000-02-02
JP2000169697A (ja) 2000-06-20
GB2344624B (en) 2000-11-15

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